Clockwork for speed-indicators.



' H. DAHL & M. MARTIN.

QLQGKWORK FOB SPEED INDICATORS.

APPLICATION rmsn 920.30. 1901.

1,069,234. Pa ented Aug; 5, 1913.

2 SHEETE'GKEET 1.

H. DAHL & M. MARTIN. GLOOKWORK FOB. SPEED mmcnons,

APPLIOATION FILED DEO.30, 1907.

Patented Aug. 5, 1913.

2 BHBBTBSHE ET 2.

' other end against the body whose speed is DEREK-LIN, GERMANY; SAIDMARTIN ASSIGWB 510 IEAISDABL .SAID EDABIL.

ctocxwoax I03. arm-.mmca'rons qpnnmcattan .0: Letters 1mm.

.ratmaaueaaeis.

To all Mamet-my concern Beit kmmm thatiwe, HANS DAHL, a sub-i ject ofthe King of Norway, and MAX MAR- TIN, a subject of the German Emperor,both 7 residing at Berlin, Prussia,-German-Empire, have invented certainntmenl -useful 'Im' 'pr'ovements in Clockworks for Speed-lndir Qcasters, of which following is a-Fspecification. I Y M Our inventionrelates to improvementsin' speed indicators of thatclass in whichclockwork is employed in determining the speed. In prior apparatuses ofthis kind the clockwork consists of the usual going-mechanism, includinga mainspring, which has to be 'wound up by a special device. Accordingto our invention, instead of driving the wheel-work by means of amainspring, we use friction clutch mechanism, one of whose parts is inrigid connection with the'said wheel-work. The operation of driving theclockwork is thus rendered considerably simpler and the action isimmediate. On form of construction of our invention is illustrated inthe accompanying drawings.

Figure 1 is a .side elevation and part section of the device. Fig. 2 isa cross section on the line A-B of F g. 1, a portion bein broken away todisplay otherwise concealed parts. Fig. 3 is a sectional view showingthe .train whose main arbor is depicted 1n the prewding fi res. Fig. 4is a cross section on the line D of Fig. 3. Fig. 5 is a sec tional viewshowing the'escape-wheel of the train depicted in FlgS: 3 and 4, inoonjunc-. tion with a part of a speed-indicator.

The rotations of the shaft, axle, or other to be indicated, are.transmitted b means of a shaft (1 and pin- .ion 6 mounte fast thereon toagear wheel a.

This wheel c is loosely mounted upon a hub d which sits loosely on theshaft f.

n is a collar holding the wheel 0 in place. The faces of the hub dconstitute friction surfaces, with one of which there engages the disk grigidly mounted on the shaft f, while against the other there bears thedisk h, which is mounted with capability of sliding axially on the shaftf. The disk h is forced constantly againstthe adjacent face of the hub dby means of a spring 1' coiled around the shaft f and pressing with itsboss of a gear k. v This latter wheelis mounted fast on the shaft f andtransmits the rotary motion of the same to the driving arbor ,m of amainspringless clockwork "(that isto say, aztmn-n of wheels, .w-i*t=hregulator, but without anyine-inspning, such for instance as is shown inFigs. 3 and Q bymeshing with a pinion l mounted fast on the arbor.

7.0, pare two stops projecting radially from hub d, and q is a sSfiIldnpnotuuding from the side of the gear 0 between the two stops 0, p. Thestud g is connected by a spring 1" withja pin 8 on the .c rotates, thestud q bears against the stop 0, as indicated by the dotted llnes g(Fig. 2). The arbor m (Figs. 1 and 2) by its rotation drives theclockwork-train shown in Figs. 3 and 4, causing the toothed wheel E andinion F to rotate the escapewheel G, which is engaged by the allets ofthe anchor H, which cooperates wlth the anchor-fork I engaging theimpulse-disk K of the'balance L having a spiral spring M, all inwell-known manner.

In Fig. 5, T is a cam mounted on the same arbor as the escape-wheel G(Figs. 3 and 4). R, R, R are spring-actuated levers engigingperiodically with the ratchet-wheels Y, Z, influencing thespeed-indicator in familiar manner. (See U. S. Patent No. 928635,granted tons on July 20, 1909).

' The 0 eration of the apparatus is as follows: en the car axle (orother body Whose speed is to be indicated) rotates, the shaft a andpinion b will cause the gear 0 to' turn in the direction of the arrow(Fig. 2). Thestud g on the side of -'the gear 0 will thus strike thestop 0 projecting from the hub d, so that the latter will be rotatedalso. Since the disks g,h bear firmly against the ends of the hub d theshaft f Wlll be rotated and its motion will be transmittedby the gear 70and pinion Z to the arbor m, so that the mainspringless clockwork isthus driven direct. Too sudden collision between the stud 1 and stop 0on starting the car (or the li e) is prevented by the spring 7'.

Having thus described our invention, what we claim as new and desire tosecure by Letters Patent of the United States is 1. A timin mechanismincluding a source of power, a Friction clutch, a re lator, andconnecting gearing, one side 0 the clutch being driven by the source ofpower, and the other side being rigidly connected to the regulator.

hub d. When the wheel of power; a friction clutch having a shaft, oneside of the clutch beinlg rigidly mounted on the shaft, while the ot erside is loosely mounted thereon, and presents two stops, and carries aloose gear wheel having a stud located between the two stops; a gearmeshing with the said gear wheel for transmitting motion thereto fromthe source of power; a regulator; and gearing rigidly connecting thefirst said clutch-side to the regulator.

3. A timing mechanism including a source of power; a friction clutchhaving a shaft, one side of the clutch being rigidly mounted on theshaft, while the other side is loosely mounted thereon, and presents twostops,

and carries a loose gear wheel having a stud located between the twostops, and is provided with a spring connecting it to the said stud; agear meshing with the said gear wheel for transmitting motion theretofrom the source of power; a regulator; and gearing rigidly connectingthe first said clutchside to the regulator.

In testimony whereof we afiix our signatures in presence of twowitnesses.

HANS DAHL. MAX MARTIN.

